Marketing website improvements (#3169)

* Website improvement

* Improve website design

* Start writing script for user guide

* Begin adding user guide

packages/twenty-website/src/app/components/PostImage.tsx

@@ -0,0 +1,7 @@
+
+
+import Image from 'next/image'
+
+export const PostImage = ({ sources, style }: { sources: { light: string, dark: string }, style?: React.CSSProperties }) => {
+    return <Image src={sources.light} style={style} alt={sources.light} />
+}